Fix FTBFS due to redefine the 'round' symbol in korganizer. #48

Unfortunately, this emerged as a new issue during the R14.0.9 build test on the newly released FreeBSD 12.2. Because R14.0.9 is already tagged for the final release, it is not possible to incorporate this fix at this time.

Same as for the "log" PR, I find this problem a bit weird. Why it does not show up in other distros? Perhaps in BSD we are using different building option?

Here round conflicts with the function defined in math.h:

FAILED: korganizer/printing/CMakeFiles/korg_stdprinting-shared.dir/calprintpluginbase.cpp.o
/usr/bin/c++ -DHAVE_CONFIG_H -D_FILE_OFFSET_BITS=64 -Dkorg_stdprinting_shared_EXPORTS -Ikorganizer/printing -I../ -I../korganizer/interfaces -I../libtdepim -I/opt/trinity/include -I/usr/local/include/tqt3 -I/usr/local/include/tqt -I/usr/local/include -g  -DQT_NO_ASCII_CAST -DQT_CLEAN_NAMESPACE -DQT_NO_STL -DQT_NO_COMPAT -DQT_NO_TRANSLATION -DQT_THREAD_SUPPORT -D_REENTRANT -I/usr/local/include/tqt3 -I/usr/local/include/tqt -include tqt.h -DQT_NO_ASCII_CAST -DQT_CLEAN_NAMESPACE -DQT_NO_STL -DQT_NO_COMPAT -DQT_NO_TRANSLATION -DQT_THREAD_SUPPORT -D_REENTRANT -includetqt.h -g -fPIC -MD -MT korganizer/printing/CMakeFiles/korg_stdprinting-shared.dir/calprintpluginbase.cpp.o -MF korganizer/printing/CMakeFiles/korg_stdprinting-shared.dir/calprintpluginbase.cpp.o.d -o korganizer/printing/CMakeFiles/korg_stdprinting-shared.dir/calprintpluginbase.cpp.o -c ../korganizer/printing/calprintpluginbase.cpp
../korganizer/printing/calprintpluginbase.cpp:41:12: error: functions that differ only in their return type cannot be overloaded
inline int round(const double x)
       ~~~ ^
/usr/include/math.h:318:8: note: previous declaration is here
double  round(double);
~~~~~~  ^

Fix FTBFS due to redefine the 'round' symbol in korganizer. #48

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